Energy Equations

Question 1

Kinetic energy

Answer 1

Kinetic energy= 0.5 x mass x speed^2

Ke= 0.5 x m x v^2

Kinetic energy - joules
Mass - kg
V- meters per second

Question 2

Elastic potential energy

Answer 2

Eplastic potential energy= spring constant x extension

EPE= 0.5 x k x e^2

Elastic potential energy- joules
Spring constant- newtons per meter
Extension- meters

Question 3

Gravitational potential energy

Answer 3

Gravitational potentinal energy= mass x gravitational feild strength x height

GPE = m x g x h

Mass - kg
Gravitational potential energy- N/kg
Height - meters

Question 4

Change in thermal energy

Answer 4

Change in thermal energy= mass x specific heat capacity x temperature change

Question 5

Power

Given energy transferred

Answer 5

Power = energy transferred / time

P = E/T

Power- watts
Energy transferred- joules
Time- seconds

Question 6

Power

Given work done

Answer 6

Power = work done / time

P = W/T

Power- watts
Work done- joules
Time- seconds

Question 7

Period

Answer 7

Period = 1/ frequency

Question 8

Velocity

Answer 8

Velocity = frequency x wavelength

V = F x λ

Velocity - Meters per second
Frequency - herts
Wavelength - meters